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Research and analysis

C7b: Long-term changes in the mean maximum length of demersal fish communities in UK waters and surrounding areas, 1983 to 2020

Updated 1 December 2025
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Location Description Survey Change Direction value
North Sea - Central West GNSIntOT1 Change Direction Decrease
North Sea - North East GNSIntOT1 Change Direction No change
North Sea - Orkney/Shetlands GNSIntOT1 Change Direction No change
North Sea - South East GNSIntOT1 Change Direction Decrease
North Sea - South West GNSIntOT1 Change Direction Decrease
Eastern Channel - French Coast GNSEngBT3 Change Direction Increase
Eastern Channel - Deep Water GNSEngBT3 Change Direction Increase
Eastern Channel - English Coast GNSEngBT3 Change Direction Increase
West of Scotland - Clyde CSScoOT1 Change Direction Decrease
West of Scotland and West of Clyde CSScoOT1 Change Direction No change
North of Ireland - Coast CSScoOT1 Change Direction No change
West of Scotland and North of Ireland CSScoOT1 Change Direction No change
West of Scotland and North West of Ireland CSScoOT1 Change Direction No change
West of Scotland - Deep Water CSScoOT1 Change Direction Decrease
North West Coast of Scotland CSScoOT1 Change Direction No change
North and West of Scotland - Mid Depth CSScoOT1 Change Direction No change
North West of Scotland - Deep Water (red2_lam) CSScoOT1 Change Direction No change
North West of Scotland - 'Windsock' CSScoOT1 Change Direction Increase
North West of Scotland - Deep Water (red1_lam) CSScoOT1 Change Direction No change
Far West of Scilly Isles - Small Mid Depth Area CSFraOT4 Change Direction No change
Far West of Scilly Isles - Small Deep Area CSFraOT4 Change Direction No change
West of Scilly Isles - Small Deep Area CSFraOT4 Change Direction No change
West of Scilly Isles - Small Mid Depth Area CSFraOT4 Change Direction No change
Southern Celtic Sea - Shallow CSFraOT4 Change Direction No change
Southern Celtic Sea - Mid Depth CSFraOT4 Change Direction No change
Southern Celtic Sea - Deep CSFraOT4 Change Direction Decrease
West of Ireland - Coast CSIreOT4 Change Direction Increase
West of Ireland - Mid Deep CSIreOT4 Change Direction No change
West of Ireland - Deep CSIreOT4 Change Direction Decrease
South East of Ireland - Coast CSIreOT4 Change Direction Increase
South East of Ireland - Mid Depth CSIreOT4 Change Direction Increase
South West of Ireland - Coast CSIreOT4 Change Direction No change
South West of Ireland - Mid Depth CSIreOT4 Change Direction No change
South West of Ireland - Deep CSIreOT4 Change Direction No change
Irish Sea - Eastern Coast CSEngBT3 Change Direction Increase
Irish Sea - Western Coast CSEngBT3 Change Direction No change
Irish Sea - Isle of Man CSEngBT3 Change Direction Increase
Irish Sea - South CSEngBT3 Change Direction Increase
Bristol Channel (StratumC) CSEngBT3_Bchannel Change Direction Increase
Wider Atlantic - Rockall Bank Shallowest WAScoOT3 Change Direction Decrease
Wider Atlantic - Rockall Bank Mid Depth WAScoOT3 Change Direction Decrease
Wider Atlantic - Rockall Bank Deep WAScoOT3 Change Direction No change
Wider Atlantic - Rockall Bank Very Deep WAScoOT3 Change Direction No change
Wider Atlantic - Porcupine Bank - East WASpaOT3 Change Direction No change
Wider Atlantic - Porcupine Bank - South WASpaOT3 Change Direction Increase
Wider Atlantic - Porcupine Bank - North WASpaOT3 Change Direction No change
Wider Atlantic - Porcupine Bank - Deep Western Waters WASpaOT3 Change Direction No change
Wider Atlantic - Porcupine Bank - Far South WASpaOT3 Change Direction Increase
Wider Atlantic - Porcupine Bank - Very Far South WASpaOT3 Change Direction Increase